What is input shaping 3d printing?

Input shaping is a vibration-reduction technique used in modern 3D printers (especially high-speed CoreXY machines like Bambu Lab X1/P1/A1, Prusa MK4/XL with input shaper, Voron, RatRig, Creality K1, Anycubic Kobra 2 Pro, etc.) to dramatically reduce or eliminate ringing/ghosting artifacts while allowing much faster print speeds.

What problem does it solve?

• When a 3D printer’s printhead accelerates, decelerates, or changes direction quickly, the frame and mechanical components resonate at certain natural frequencies. These vibrations show up on the print as “ringing” or “ghosting” — wavy patterns or duplicated features, especially visible after sharp corners.Traditional solution: Print slower (lower acceleration/jerk) so the vibrations never get excited in the first place.Input shaping solution: Let the printer move fast, but intelligently cancel out the vibrations before they happen.

How Input Shaping Works (simply)

• The printer has an accelerometer (usually built into the mainboard or toolhead).

• During a calibration routine, the printer bangs the axes around and measures how the frame rings (resonance frequencies, usually 30–150 Hz depending on the printer).

• The firmware (Klipper is the most common, Marlin also supports it now) calculates a very short “shaper” filter (typically 2–4 pulses lasting 10–50 ms).

• Instead of sending one big acceleration command to the motors, the firmware splits it into a sequence of smaller pulses that are timed so the vibrations from the first pulse cancel out the vibrations from the later pulses.

• Result → almost zero ringing even at 10,000–20,000 mm/s² acceleration and 300–600 mm/s speeds.

Common Types of Input Shapers